<form id="math" action="#">
	<fieldset>
	<legend>MathProcessor</legend>
	<label>Expresso</label><input type="text" name="exp" value="(medium(sum(1, 0, 1), 1) + .5) / 2 * 2 + 1" /><br /><br />
	<input type="submit" value="MathProcessor.parse()" />
	</fieldset>
</form>

<script type="text/javascript">
//<![CDATA[

var p = new MathProcessor(), f = document.forms.math;

addEvent(document.forms.math, "submit", function(e){
	e.preventDefault();
	try{
		alert(p.parse(f.exp.value));
	}catch(e){
		alert(e);
	}
});

//]]>
</script>